125B · 2 knobs
Orpheus SiliconFuzz
Based on the Mosrite Fuzzrite· 3 other boards clone it
- Category
- Fuzz
- Controls
- Depth · Volume
- Difficulty
- Beginner
- Price
- $12.50in stock
From the vendor
An updated version of the classic fuzz from the late 1960s, featuring silicon transistors in a unique two-stage blending arrangement.
The Orpheus Silicon Fuzz is based on the silicon version of the Mosrite Fuzzrite, which replaced the germanium version in 1968 around the time that the Fuzz Face and other fuzz circuits were moving to silicon as well. As with the germanium version, it was designed by Ed Sanner.
The circuit topology is largely the same as the germanium version, but it runs on modern negative-ground power due to the NPN transistors, whereas the germanium version uses a charge pump inverter. The two circuits have very different fuzz textures and both are worth your time. The silicon version seems to have been much more widespread, and was whitelabeled or cloned as the Orpheum Fuzz, Guild Foxey Lady, and Electro-Harmonix Axis Fuzz.
Catalinbread released an adaptation in 2010 called the Merkin Fuzz. Later in 2015, they teamed up with the Moseley estate and Ed Sanner to release an official reissue of the Fuzzrite, which was based on the silicon version. The germanium version followed in 2023, and included a “vintage/modern” toggle switch that reduces the steep bass cut of the original and fills out the midrange of the effect for a more modern sound.
We have ported this switch to the silicon version of the Fuzzrite circuit, which suffers from the same issues in the stock configuration.
Schematic
The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 30 rows
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| R3 | 470k | 470k | Metal film resistor, 1/4W | Orpheum: 10M; Axis/Foxey: omit (leave empty) |
| R4 | 470k | 470k | Metal film resistor, 1/4W | Orpheum & Axis/Foxey: 22k |
| R8 | 470k | 470k | Metal film resistor, 1/4W | Orpheum: 1M; Axis/Foxey: omit (leave empty) |
| R9 | 470k | 470k | Metal film resistor, 1/4W | Orpheum & Axis/Foxey: 47k |
| R12 | 22k | 22k | Metal film resistor, 1/4W | Some versions of the Fuzzrite omit this resistor. See build notes. |
| R13 | 1M2 | 1.2M | Metal film resistor, 1/4W | Orpheum & Axis/Foxey: omit (leave empty) |
| R14 | 100k | 100k | Metal film resistor, 1/4W | Orpheum & Axis/Foxey: omit (leave empty) |
| R15 | 100R | 100 | Metal film resistor, 1/4W | Power supply filter resistor. |
| RPD | 2M2 | 2.2M | Metal film resistor, 1/4W | Input pull-down resistor. |
| LEDR | 10k | 10k | Metal film resistor, 1/4W | LED current-limiting resistor. |
| Capacitors 8 | ||||
| C1 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | Orpheum & Axis/Foxey: 100n |
| C3 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | Orpheum & Axis/Foxey: 100n |
| C6 | 2n2 | 2.2n | Film capacitor, 7.2 x 2.5mm | Axis/Foxey: 3n3 |
| C7 | 4n7 | 4.7n | Film capacitor, 7.2 x 2.5mm | Part of the Mode switch mod. Can increase to 8n2 for more bass. |
| C8 | 2n2 | 2.2n | Film capacitor, 7.2 x 2.5mm | Axis/Foxey: 3n3 |
| C9 | 4n7 | 4.7n | Film capacitor, 7.2 x 2.5mm | Part of the Mode switch mod. Can increase to 8n2 for more bass. |
| C10 | 100uF | 100u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| C11 | 100n | 100n | MLCC capacitor, X7R | Power supply filter capacitor. |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| Transistors 2 | ||||
| Q1 | 2N3904 | 2N3904 | BJT transistor, NPN, TO-92 | |
| Q2 | 2N3904 | 2N3904 | BJT transistor, NPN, TO-92 | |
| Potentiometers 2 | ||||
| DEPTH | 500kB | B500k | 16mm right-angle PCB mount pot | Orpheum: 1MB; Axis/Foxey: 100kB |
| VOLUME | 50kA | A50k | 16mm right-angle PCB mount pot | Orpheum: 100kB; Axis/Foxey: 100kA |
| Switches 2 | ||||
| MODE | DPDT on-on | DPDT ON-ON | Toggle switch, DPDT on-on | |
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | |
| Jacks & sockets 3 | ||||
| IN | 1/4" stereo | 1/4" STEREO | 1/4" phone jack, closed frame | Switchcraft 112BX or equivalent. |
| OUT | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| DC | 2.1mm | 2.1MM | DC jack, 2.1mm panel mount | Mouser 163-4302-E or equivalent. |
| Hardware 2 | ||||
| BATT | Battery snap | BATTERY SNAP | 9V battery snap | Optional. Use the soft plastic type—the hard-shell type will not fit. |
| ENC | 125B | 125B | Enclosure, die-cast aluminum | Can also use a Hammond 1590N1. |
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